[PROTOTYPE][DO_NOT_MERGE] Streaming write schema evolution#55279
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johanl-db wants to merge 2 commits intoapache:masterfrom
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[PROTOTYPE][DO_NOT_MERGE] Streaming write schema evolution#55279johanl-db wants to merge 2 commits intoapache:masterfrom
johanl-db wants to merge 2 commits intoapache:masterfrom
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Hi, @johanl-db . FYI, GitHub provides Draft feature to help your case. To prevent merging or reviewing systematically, the Apache Spark community recommend to use the standard Draft PR.
[PROTOTYPE][DO_NOT_MERGE] Streaming write schema evolution
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What changes were proposed in this pull request?
Path-finding: attempting to automatically evolve the schema of the sink during streaming writes when the sink table reports capability
AUTOMATIC_SCHEMA_EVOLUTIONThis is a crude prototype and doesn't consider implications that evolving the sink schema may have on streaming semantics.
There's also no user-surface to enable schema evolution on a stream today. Delta uses for example
.option("mergeSchema", "true"), but Spark itself doesn't provide an a user surface for schema evolution. In this change, we assume that a connector implementation will intercept theWriteToMicroBatchDataSourcenode to enable schema evolution on it as needed